Ry Cooder recommendation...

Into the Purple Valley and Chicken Skin Music Live (esp. the latter, where he plays nothing but his Stratocaster with some excellent slide work).

The following two titles will not qualify as “stripped down”, but certainly worth consideration:

 

Little Village

Buena Vista Social Club

 

The following two titles are both movie soundtracks and will come somewhat closer to your criteria:

 

Music from the Film Cal

Crossroads

 

Cheers,

Chicken Skin Music - a record that will reward listeners forever.

Ditto to all the recommendations above and I'll add Paradise and Lunch. The man's a national treasure.

Many of Ry's albums are pretty eclectic. He liked to do old depression-era stuff, gospel, calypso, and world music. He sings the lead vocals on much of his music and, while an adequate singer, his singing is not his strong suit.
There is a 2-CD set of his soundtrack work called Music By Ry Cooder which includes a lot of the solo slide guitar that you're referring to.